Definition

Computed tomography angiography (CTA) is a specialized x-ray that examines blood flow in blood vessels when they are filled with a contrast material. Contrast material is a substance that makes the blood vessels show on an x-ray. Computed tomography (CT) uses a complex machine to take x-rays from many different views, producing detailed 2-dimensional images that can be combined by a computer to form 3-dimensional images.

CTA can be used to view blood vessels throughout the body. It is most commonly used to study the:

Possible Complications

Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like:

Allergic reactions to contrast material

Excess bleeding

Kidney damage

What to Expect

Prior to Test

Prior to the surgery, the doctor will do a physical exam.

Talk to your doctor about any medications, herbs, or supplements you are taking.
You may have to stop certain medications, food, or beverages before the test.

At the care center:

You will remove your clothes and put on a gown or robe.

You will remove all jewelry, hair clips, dentures, and other objects that could show on the x-rays and make the images hard to read.

Description of Test

An IV is placed in a vein, and you will lie down on a narrow table. Pillows and straps may be used to keep you in a certain position. The part of your body that will be studied is moved inside the opening of the CT machine, and a test image is taken. You will be given a small amount of contrast material through the IV to check how long it takes to get to the area to be studied. Next, the IV is connected to an automatic injector and contrast material is injected. Then, the scan begins.

You must stay still during the scan. You will be asked to hold your breath for 10-25 seconds to ensure that the images are not blurred by any movement. It only takes seconds to record all the images needed.

After Test

The images are checked. If needed, some are repeated.

After the procedure, be sure to follow your doctor's
instructions
.
During the hours after the procedure, drink extra fluids to help flush the contrast material from your body.

How Long Will It Take?

20-60 minutes

Will It Hurt?

Although the procedure is not painful, you may feel warm and flushed when contrast material is injected.

Results

The findings will be reported to your doctor, usually within 24 hours. Your doctor will discuss the findings with you and any treatment needed.

Revision Information

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.